Fragmentation. You'll often hear people say this is a major problem with Google's Android platform; there are many devices running multiple different versions of the mobile operating system, leading to fragmentation. Dan Morrill, Android's open source and compatibility program manager, addresses this issue in a blog post, and details what Google is doing to fight it. The gist: it's a non-issue - according to Google, that is.

According to the latest chart, 45% of all Android devices that can access the market are running 2.1. How many of those have upgraded, and how many are simply new devices crowding out the older ones... well, that remains to be seen. Google hasn't published actual numbers to go with that pie chart.